Rotary photogravure printing apparatus



y 1953 A. M. HALLE.Y 2,638,844

ROTARY PHOTOGRAVURE PRINTING APPARATUS Filed June 29, 1950 i i l V l a i I 10% i T i I l .l l I I i I All GUS MURRAY HALLEY Patented May 19, 1953 ROTARY PHOTOGRAVURE PRINTING APPARATUS Angus Murray Halley, Moseley,

Birmingham, England Application June 29, 1950, Serial No. 171,154

In Great Britain May 8, 1950 Claims. (Cl. -1--169) paratus of the kind incorporating a doctor blade adapted to wipe excess ink from the periphery of an image cylinder and the present invention has particular reference to a means of fixing and adjusting such a doctor blade within a housing.

The object of the present invention is to pro vide a means of mounting the doctor blade within its housing which will admit of the ready removal thereof and also the adjustment of the blade within the housing in relation to the image cylinder with which it i associated so as to achieve line contact of the doctor blade with the periphery of the image cylinder throughout the whole of its length.

The invention consists of a means of mounting and adjusting a doctor blade within a housing characterised in that the doctor blade is held in a recess in a carrier by means of a plurality of expanding clamps the carrier being capable of a lateral sliding motion in a recess in the housing under the influence of eccentrics carried by rotatable spaced studs in the housing.

The invention will now be described with particular reference to the accompanying drawings in which:

Fig. 1 is a section through a housing incorporating the doctor blade and Fig. 2 is a plan of a portion of the doctor blade housing seen in Fig. 1.

The housing 3, for the doctor blade is of quasicylindrical form and is provided with a longitudinal slot 4 so as to provide a recess within which is slidably accommodated a carrier 5, this carrier is provided with a longitudinal recess 6 within which the thin metal strip doctor blade 1 is mounted. The doctor blade is held against a wall of the recess 6 by placing a strip of heavier gauge metal 8 against its other face and then expanding between the strip 8 and the opposite wal1 of the recess 6 a plurality of expandable clamps 9 of the kind commonly known in the printing trade as quoins. These quoins are disposed at spaced intervals in the recess 6 throughout the length thereof and each comprises two sections 9 having inclined interior faces with which co-operate a wedge block 9 engaged by a screw 9, it being appreciated that a tightening of the screw 9 causes the wedge block 9 to ride upon the inclined faces of the two parts 9 so as to force them apart. Such an expandable clamp or quoin is well known in the printing trade and per se forms no part of the present invention. The upper face of the carrie 5 is provided with a plurality of longitudinal extending slots 5 in which are rotatable the eccentric portions Ill of the shanks of rotatable plug l0 mounted in apertures I I in the housing'3 at intervals corresponding to the spacing of the slots 5 in the carrier 5. Also mounted in the carrier 5 are a plurality of pins l2 which pass through hollow bores in the plugs l0 and carry at their free ends lock nuts 13 whereby the plugs H] can be restrained from rotation.

When it is desired to adjust the amount by which the doctor blade 1 protrudes from the housing 3 the lock nuts l3 are slackened and the plugs H] are rotated so that the eccentric portions w acting in the slots 5 cause the carrier 5 and contained doctor blade 1 to slide laterally within the recess 4. This limited lateral movement of the carrier 5 relative to the housing 3 is permitted by a clearance obtaining between the pin l2 and the bore of the plug I0.

I claim:

17 In a rotary photogravure printing apparatus a means of mounting and adjusting a, doctor blade within a housing comprising, in combination, a longitudinally recessed generally cylindrical housing, a carrier laterally slidable in the recess in the housing and having a rectangular recess along its exposed side, a doctor blade in the recess in the carrier, a plurality of expandable clamps in the recess in the carrier for retaining the doctor blade therein, said housing having a plurality of bores each of which intersects one side of the recess in the housing and is substantially perpendicular to such side and eccentric rotatable means in the bores of the housing and engaging the carrier for imparting a lateral movement to the carrier in the housing.

2. In a rotary photogravure printin apparatus a means of mounting and adjusting a doctor blade within a housing comprising, in combination, a longitudinally recessed generally cylindrical housing, a carrier laterally slidable in the recess in the housing, said carrier having a longitudinal rectangular recess in its exposed edge, a doctor blade in the recess in the carrier, a plurality of expandable clamps for retaining the doctor blade in the recess of the carrier, said housing having a plurality of bores intersecting a side of the recess in the housing, and a plurality of rotatable plugs in the bores in the housing having eccentric portions engaging slots in the Carrier f r p t ng a lateral movement to the carrier in the housing.

3. In a rotary photogravure printing apparatus a mean of mounting and adjusting a doctor a wall of aha-said wecess isaid housing liaving a plurality oftbores intersecting a side ofethe-zrecessr in the housing and a plurality of rotatable plugs 4 blade in the recess in the carrier against the one wall thereof, a metal strip in the recess in the carrier on the opposite side of the doctor blade, a plurality of spaced expandable clamp in the recess in the carrier between the strip and the opposite wall of the recess, a plurality of rotatable zplugsv mounted in bores inmher housing that intersect-111a sidaiohthe recesssthe'rein,. eccentrics on said plugs engaging slots in the carrier, pins mounted in the bores in the housing and havlngt-ioliilwthe carrier passing through hollow bores in eccentric portions engaging slots in the carrier;

4. In a rotary photogravure printing-apparatus;

a means of mounting and adjusting a doctor blade within a housing according to claimi;3 inril corporating pins fixed in the carrier andneaeh ue gy accommodated in a bore in one of the plugsand lock nuts on the extremities of saidpinsjfor'lobkfer ing the plugs against rotation.

5. In a rotary photogravure printing apparatus.

a means of mounting and adjusting a doctor 20 blade-avithin a housing comprising,...in,.combinae: tion, a longitudinally; recessedyquasiecylin'drical;I housing., =a longitudinally; recessed.,carrienal'aterer allylslidablefinthe recess. in ,theihdusingga doctonil the plug and lock nuts on said pins.

ANGUS MURRAY HALLEY.

Referencesecited in the file of this patent UNITED STATES PATENTS Numbers}? Name Date 2,L10;28l Crafts Mar. 8, 1938 2,300,908. Broughton Nov. 3, 1942 2,32'1134'2" Weiss June 8, 1943 2,330,889 Holcomb Oct. 5, 1943 FOREIGNlPATENIS. vI

Numbe'ms Countnyry Dates? 264s3349ie3 GreataBritaimni Jam20; 1927: 

